CPLEX cpxcb PRESOLVE

This page is part of the CPLEX Manual. See CPLEX.

CPLEX Presolve callback.

Called at regular intervals from TOMLAB /CPLEX during presolve.

This callback is enabled by setting callback(6) = 1 in the call to cplex.m, or P rob.M I P.callback(6) = 1 if using tomRun('cplex',...).

cpxcb PRESOLVE is called with one argument, the cpxCBInfo progress information vector.

Contents of cpxCBInfo variable:

i	cpxCBInfo(i)		- Value
-------------------------------------------------------------
1	PRESOLVE_ROWSGONE	- number of  rows eliminated
2	PRESOLVE_COLSGONE  	- number of  columns eliminated
3	PRESOLVE_AGGSUBST  	- number of  aggregator substitutions
4	PRESOLVE_COEFFS		- number of  modified coefficients

By returning a nonzero value from cpxcb PRESOLVE, the user can terminate the optimization.

If modifying this file, it is recommended to make a copy of it which is placed before the original file in the MATLAB path.